The unsaturated zone at Yuccz Mountain is one of the primary barriers to the migration of radionuclides from the potential repository to the accessible environment, and,as such,has received great attention in site-characterization activities.This report summarizes the transprot model for the unsaturated zone at Yucca Mountain.The purpose of the modeling studies is to incorporate the latest hydrologic,mineralogic,and geochemical information into a set of numerical models to predict transport of radionuclides from the potential repository to the water table.Since these are predictions of repository performance after waste emplacement,the influence of repository waste heat and future climate changes must be accounted for.
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